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What is the difference between TPU and PU?

What is the difference between TPU and PU?
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  • Categories:Industry news
  • Author:
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  • Time of issue:2021-08-30 14:58
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(Summary description)

What is the difference between TPU and PU?
Top

(Summary description)

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2021-08-30 14:58
  • Views:
Information

 

TPU(聚氨酯弹性体)

 

TPU (thermoplastic polyurethane elastomer) is a new type of plastic. Because of its good processability, weather resistance and environmental protection, TPU is widely used in shoe materials, pipes, films, rollers, cables and wires and other related industries.

 

Polyurethane thermoplastic elastomer, also known as thermoplastic polyurethane rubber, TPU for short, is A (AB) N-type block linear polymer. A is A high molecular weight (1000-6000) polyester or polyether, B is A diol containing 2-12 straight chain carbon atoms. The chemical structure between AB chain segments is diisocyanate, usually MDI connection. Thermoplastic polyurethane rubber is crosslinked by intermolecular hydrogen bond or slightly crosslinked between macromolecular chains. With the increase or decrease of temperature, these two crosslinked structures have reversibility. In the melting state or solution state intermolecular force weakened, and after cooling or solvent volatilization there are strong intermolecular force together, restore the original solid performance.

 

Polyurethane thermoplastic elastomer has polyester type and polyether type two kinds, white irregular spherical or columnar particles, relative density 1.10-1.25, polyether type relative density is smaller than polyester type. The glass transition temperature of polyether type is 100.6-106.1℃, and the glass transition temperature of polyester type is 108.9-122.8℃. The brittleness temperature of polyether type and polyester type is lower than -62℃, and the low temperature resistance of hard ether type is worried about the polyester type. Polyurethane thermoplastic elastomer is characterized by excellent wear resistance, excellent ozone resistance, high hardness, high strength, good elasticity, low temperature resistance, good oil resistance, chemical resistance and environmental resistance, in the humid environment polyether ester hydrolysis stability is far more than polyester type.

 

Polyurethane thermoplastic elastomer is non-toxic and tasteless, soluble in methyl-ethyl, cyclohexanone, tetrahydrofuran, dioxane, dimethyl formamide and other solvents, but also soluble in toluene, ethyl acetate, butyl ketone, acetone in an appropriate proportion of the mixed solvent, showing a colorless transparent state, has good storage stability.

 

 

 

PU(聚氨酯)

 

PU, is by diisocyanate or polyisocyanate and with more than two hydroxyl compounds with the reaction of polymer compounds, the main chain contains many repeated NHCOO groups. The commonly used diisocyanates are toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexyl diisocyanate (HDI), isophorone diisocyanate (IPDI), dicyclohexyl methane diisocyanate (HMDI), polymethylene polyphenyl polyisocyanate (PAPI), benzene dimethylene diisocyanate (XDI), etc. According to the different hydroxyl components used, it can be divided into polyester type and polyether type. It can be used to manufacture plastic manufacturing products, wear-resistant synthetic rubber products, synthetic fibers, hard and soft foam products, adhesives and coatings, etc.

 

TPU and PU are essentially made of the same material. But when you make these two kinds of glue. They don't use the same formula. These two kinds of glue are divided into many kinds of performance. The characteristics of the glue made by different formulas are not the same. These properties refer to mechanical and physical properties.

 

 

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